Study On The Damage Mechanical Characteristics Of Artificially Prepared Site Soil By Dry-wet And Freeze-thaw

Our country has a long history,leaving countless earthen ruins on the land of China for five thousand years.The earthen ruins have important scientific research value,but they have suffered severe environmental damage in modern times.Especially in western China,earthen ruins are being affected by rain soaking and seasonal freezing and melting.Therefore,it is extremely urgent to reinforce and protect earthen ruins.At the same time,it is necessary to understand and master the damage mechanism of artificially prepared ruins soil under the action of dry-wet and freeze-thaw cycles,and accurately predict and evaluate them.Protection is extremely important.Based on indoor direct shear,triaxial and confined compression tests,this paper uses the theory of damage mechanics to analyze the disturbance and damage characteristics of artificially prepared site soil under dry-wet and freeze-thaw cycles,and uses triaxial test data to determine the parameters of the Duncan-Chang model.To solve the problem,the mechanical damage characteristics and damage mechanism analysis of artificially prepared site soil under the action of dry-wet and freeze-thaw cycles are systematically studied.The specific work is as follows:(1)Through direct shear tests,the shear strength parameters of artificially prepared ruins soil under different mass ratios of soil to glutinous rice slurry were studied with the effects of dry-wet cycles,freeze-thaw cycles,and dry-wet and freeze-thaw coupled cycles;based on damage Mechanical theory,using shear strength parameters to establish damage factors,and analyze the damage mechanism and evolution law of artificially prepared site soil under the action of dry-wet-freeze-thaw cycles.(2)Through the confined compression test,the confined compressive strength of artificially prepared ruins soil under different mass ratios of soil to glutinous rice pulp was studied with the effects of dry-wet alternation,freeze-thaw cycles,and dry-wet and freeze-thaw coupled cycles;and Analyze the attenuation law of the confined compressive strength of the artificially prepared site soil under the combined effects of dry-wet and freeze-thaw cycles,cycle times and different ratios.(3)Through the triaxial consolidation drainage shear test,the effects of the different ratios of soil and glutinous rice pulp quality,consolidation pressure and the number of dry-wet and freeze-thaw cycles on the principal stress difference and axial strain of the artificially prepared site soil were studied.,Destruction strength and the influence of shear strength parameters.The attenuation law of shear strength parameters of artificially prepared relic soils with different proportions under the combined effects of dry-wet and freeze-thaw cycles is analyzed;based on the theory of damage mechanics,the effects of dry-wet and freeze-thaw coupling on the cohesive force and internal friction angle are considered based on the theory of damage mechanics influences.(4)Based on the triaxial test data,the parameters of the Duncan-Chang model are solved,using the theory of damage mechanics,the damage factor is introduced,and the influence of the coupling effect of dry and wet-freeze and thaw on the parameters of Duncan-Chang is considered.